Windmill Puzzle (Rated 1386): Win Material — Discovered Attack

This puzzle is a classic example of a discovered attack in a sharp middlegame-to-endgame transition. White’s bishop and queen coordinate against the black king, while the black queen and rook are overloaded and vulnerable. The key idea is that one piece can move with tempo, uncovering a stronger line of attack behind it. That hidden pressure forces a response and opens the door to a decisive gain of material, with the king’s safety becoming the main factor.